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Summary

The QoS (Quality of Service) page is used to set up Smart Queue Management (SQM) instances which can limit the download and upload speeds of selected network interfaces.

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This manual page provides an overview of the QoS windows in {{{name}}} routers.

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Smart Queue Management

The Smart Queue Management section contains a list of existing SQM instances and can be used manage them (edit/delete/enable/disable). By default the list is empty:

To add a new instance and begin editing, look below to the Add New SQM Configuration section and:

enter a custom name in the 'Name' field;
click the 'Add' button;
click the 'Edit' button next to newly created instance.

Refer to the sections below for information on editing SQM instances.

Basic Settings

The Basic Settings section is used to set download and upload speed limits for a selected network interface.

Field	Value	Description
Enabled	off \| on; default: off	Turns the SQM configuration on or off.
Interface name	network interface; default: br-lan (lan)	Selects to which interface this SQM configuration will apply. Additional note: consider reading the [[{{{name}}}__QoS#Additional_notes\|Additional notes]] section before limiting speeds on selected interfaces.
Download speed (kbit/s)	integer [0..9999999999999999]; default: none	Limits the download speed (ingress) of the selected interface to the value specified in this field.
Upload speed (kbit/s)	integer [0..9999999999999999]; default: none	Limits the upload speed (ingress) of the selected interface to the value specified in this field.

Advanced Settings

The Advanced Settings section describes the internal logic of the SQM configuration.

Field	Value	Description
Queuing disciplines usable on this system	cake \| fq_codel; default: cake	Queue management logic type. Look to the row below for detailed information.
Queue setup script	layer_cake.qos \| piece_of_cake.qos \| simple.qos \| simplest.qos \| simplest_tbf.qos; default: piece_of_cake.qos	Describes the queue management logic. cake layer_cake.qos - uses the cake qdisc as a replacement for both htb as shaper and fq_codel as leaf qdisc. This exercises cake's diffserv profile(s) as different "layers" of priority. piece_of_cake.qos - uses the cake qdisc as a replacement for both htb as shaper and fq_codel as leaf qdisc. It just does not come any simpler than this, in other words it truly is a "piece of cake". fq_codel simple.qos - BW-limited three-tier prioritisation scheme with your qdisc on each queue. simplest.qos - simplest possible configuration: HTB rate limiter with your qdisc attached. simplest_tbf.qos - simplest possible configuration (TBF): TBF rate limiter with your qdisc attached. TBF may give better performance than HTB on some architectures.

Additional notes

Please consider that limiting the speed of certain interfaces may limit the speed of other interfaces as well. For example, if you limit the download and upload speeds of the default LAN interface (br-lan) to 50 000 kbps (50 Mbps) this will affect the speeds between:

Ethernet LAN machines (including the router)
Ethernet LAN machines and WAN*

* Since LAN machines communicate with WAN servers over the router which is also considered a LAN machine, LAN-to-WAN and WAN-to-LAN speeds are also affected.

The table below demonstrates speed changes between some of the main default network interfaces if br-lan speed is set to 50 Mbps.

	Ethernet LAN	Ethernet WAN	Mobile WAN
Ethernet LAN	50	50	50
Ethernet WAN	50	unchanged	unchanged
Mobile WAN	50	unchanged	unchanged

Changing the speeds of other network interfaces may also affect more than one interface. However, the Ethernet LAN interface (br-lan) is related to most interfaces. Therefore, it is advised to limit the speeds of other interfaces in order to achieve more precise results (unless, of course, your goal to is to limit the speed of br-lan).

Another example to consider is limiting WAN interface speeds since that is the most widely implemented use case and affects less interface-to-interface relationships. For instance, limiting Ethernet WAN (eth1) speed to 50 Mbpswould produce the following results:

	Ethernet LAN	Ethernet WAN	Mobile WAN
Ethernet LAN	unchanged	50	unchanged
Ethernet WAN	50	unchanged	unchanged
Mobile WAN	unchanged	unchanged	unchanged

Please take caution when using SQM to limit speeds in order to avoid unexpected results.

Add New SQM Configuration

The Add New SQM Configuration is used to create new SQM instances. Simply enter a custom name for the new instance and click the 'Add' button. You will find the newly added instance in the "[[{{{name}}}_QoS#Smart_Queue_Management|Smart Queue Management]]" section right above this one.

[[Category:{{{name}}} Services section]]